Phosphor position in light emitting diodes
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United States of America Patent
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Apr 23, 2013
Grant Date -
Mar 6, 2008
app pub date -
Aug 16, 2007
filing date -
Sep 1, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A method of forming an LED lamp with a desired distribution of phosphor is disclosed. The method includes the steps of mixing a plurality of phosphor particles in an uncured polymer resin for which the viscosity can be controlled in response to temperature to form a substantially uniform suspension of the phosphor particles in the resin. The uncured resin is then placed into a defined position adjacent an LED chip and the temperature of the resin is increased to correspondingly decrease its viscosity but to less than the temperature at which the resin would cure unreasonably quickly. The phosphor particles are encouraged to settle in the lowered-viscosity resin to a desired position with respect to the LED chip, and the temperature of the resin is thereafter increased to the point at which it will cured and solidify.
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